Psychopathic Girl Movie

A girl that I think was a very young teenager she had brown hair. She was inside someones house hiding getting ready to kill them. I can’t remember but I think she had a fire poker as a weapon. Afterwards she left and walked up the street and talked to someone I think. I cannot find this movie or TV episode. She was either a killer or a crazy girl. I’m not 100% sure she killed someone in this scene I can barley remember, this would be a 1980s or 1990s movie. Early 2000s the most.